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The Spears Group is a group of geologic formations exposed in and around the northeast Mogollon-Datil volcanic field of southwestern New Mexico. [ 2 ] [ 3 ] It has a radiometric age of 33 to 39 million years, corresponding to the Eocene to Oligocene epochs .
The formation was first named by E.D. Cope in 1882 for exposures at Lake Valley, Sierra County, New Mexico. [3] In 1941, Laudon and Bowsher removed the lowermost beds into the Caballero Formation and divided the Lake Valley Limestone into the Alamgordo, Arcente, and Dona Ana Members. [4] In 1949, they added the Andrecito, Nunn, and Tierra ...
The Maxwell Land grant has an area of 1,714,765 acres (6,939.41 km 2) in New Mexico and southern Colorado.The grant lands measure almost 60 miles (97 km) from north to south and 50 miles (80 km) from east to west, reaching from the Great Plains to the crest of the Sangre de Cristo Mountains.
The geology of New Mexico. A geologic history: New Mexico Geological Society Special Volume 11. pp. 95–136. ISBN 9781585460106. Pray, L.C. (1954). "Outline of the stratigraphy and structure of the Sacramento Mountain escarpment [Otero County, New Mexico]" (PDF). New Mexico Geological Society Field Conference Guidebook. 5: 92–107
The exposures near Jemez Springs include some of the richest brachiopod fossil beds in North America. Crinoid stems and bryozoans are also part of the fossil assemblage. The formation is also exposed in the canyon of Rio Grande del Rancho south of Talpa, New Mexico, where brachiopods, crinoids, rugose coral, and graptolite fossils can be found.
The Dockum is a Late Triassic (approximately late Carnian through Rhaetian, or 223–200 Ma) geologic group found primarily on the Llano Estacado of western Texas and eastern New Mexico with minor exposures in southwestern Kansas, eastern Colorado, and Oklahoma panhandle. [1]
This past summer, Sacramento had its hottest 20-day stretch on record, averaging 103.8 degrees during those three weeks from June 23 to July 12. On July 5, the temperature reached 110. The next ...
The geology of New Mexico. A geologic history: New Mexico Geological Society Special Volume 11. New Mexico Geological Society. pp. 95–136. ISBN 978-1585460106. Lucas, Spencer G.; Barrick, James E.; Krainer, Karl; Schneider, Jorg W. (2016). "Pennsylvanian-Permian boundary at Carrizo Arroyo, central New Mexico" (PDF). New Mexico Geological ...